Here in the UK the mux strengths and parameters are all over the place. I have had situations in the past (with dib0700 I think) where I've had to twiddle the force_lna setting one way or the other depending on how they've decided to reconfigure my local transmitter.
So I'd be cautious about flat-out enabling it the whole time. -- Steve Kerrison MEng Hons. http://www.stevekerrison.com/ On Fri, 2011-06-03 at 15:29 +0200, Bjørn Mork wrote: > Antti Palosaari <cr...@iki.fi> writes: > > On 06/01/2011 04:27 PM, Mauro Carvalho Chehab wrote: > >> Em 25-05-2011 17:42, Antti Palosaari escreveu: > >>> Antti Palosaari (7): > >>> em28xx-dvb: add module param "options" and use it for LNA > >> > >> That patch is ugly, for several reasons: > >> > >> 1) we don't want a generic "options" parameter, whose meaning changes from > >> device to devices; > > > > I agree it is not proper solution, but in my mind it is better to > > offer some solution than no solution at all. > > > >> 2) what happens if someone has two em28xx devices plugged? > > > > It depends depends devices, currently only nanoStick T2 only looks > > that param, other just ignore. If there is two nanoStics then both > > have same LNA settings. > > > > That's just like same behaviour as for example remote controller > > polling. Or for example DiBcom driver LNA, since it does have similar > > module param already. Will you you commit it if I rename it similarly > > as DiBcom? > > > >> 3) the better would be to detect if LNA is needed, or to add a DVBS2API > >> call to enable/disable LNA. > > > > True, but it needs some research. There is many hardware which gets > > signal input from demod or tuner and makes some fine tune according to > > that. We need to define some new callbacks for demod and tuner in > > order to do this kind of actions. > > Or just add new LNA param to API use it manually. > > > Or option > 4) just enable the LNA unconditionally. > > I did some testing in my environment, and I was unable to tune anything > on either DVB-T or DVB-C without the LNA enabled. I'm of course aware > that this depends on your signal, but have you actually seen a real life > signal where tuning fails with the LNA enabled and works without it? > > I do believe that my DVB-C signal at least is pretty strong. > > > > Bjørn > > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
